JPH0910196A - Bucky's device - Google Patents

Abstract

PURPOSE: To provide a Bucky's device by which an X ray radiation axis in gradient photography can be aligned simply and accurately with the center of a film loaded therein. CONSTITUTION: An arithmetic circuit 5 calculates a ratio i/D wherein D is a distance between an X-ray focus (f) and a film and (i) is a horizontally moving distance (in the longitudinal direction of a top board) from a vertical axis running through the center R of a Bucky's device (center of a film). The resultant calculation signal i/D undergoes a radian comparison using a comparator 5 with an angle θ of rotation (oscillation) of an X-ray tube unit X centered on a horizontal axis running through the X-ray focus (f), and a display lamp 6 is turned on by a coincidence signal of the comparator 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
A Bukki imaging apparatus which is held by a X-ray holder and is combined with an X-ray tube apparatus, and in particular, an X-ray emission axis emitted from the X-ray tube apparatus during tilted imaging in which a subject is irradiated with X-rays from an oblique direction for imaging. The present invention relates to a Buki photographing apparatus that can surely and easily match the center of the X-ray film mounted on the Buki photographing table.

[0002]

2. Description of the Related Art As shown in FIGS. 2 and 3, a Bukki image pickup apparatus includes a Bukki image pickup stand BT, an X-ray apparatus X, and an X-ray apparatus X.
And a floor traveling type cage S for holding. The Buki photographing base BT includes a base 21, a top plate holding frame 22 mounted on the base 21, and a top plate 23 supported by the top plate holding frame 22 and slidable in a direction indicated by an arrow in the figure. ,
The bucking device B includes a tray 26 that supports a cassette 25 that stores the X-ray film 24. The bucking device B is mounted on the top plate holding frame 22.

Further, the floor traveling type cage S is capable of traveling along a rail 27 attached to the floor F, a carriage 28 planted in the carriage 28, and vertically movable along the pillar 29. The movable pedestal 30 supported so as to be movable and the telescopic arm 31 fixed to the movable pedestal 30. The telescopic arm 31 has a collimator 32 at the tip thereof.
The X-ray tube device X is attached so as to be rotatable (pivoting) about a horizontal axis x passing through the X-ray focal point f.

In such a Bukki imaging apparatus, the X-ray tube apparatus X is positioned with respect to the subject at the time of imaging by moving the floor-moving cage S from side to side (in the direction of arrow A in FIG. 2) and the column 29 of the movable mount 30. Center of an X-ray film (hereinafter referred to as a film) 24 in which the X-ray emission axis O radiated from the X-ray tube device X is loaded on the bucky device B (hereinafter referred to as a film). This is performed by rotating (pivoting) the X-ray tube device X for matching with R about the horizontal axis x (direction of arrow C in FIG. 2). In the state shown by the solid line in FIG. 2 in which the X-ray tube device X is located right above the bucky device B,
Generally, the position of the floor traveling type retainer S where the X-ray emission axis O coincides with the film center R is detected by a micro switch or the like, so that the floor traveling type retainer S is stopped and fixed at the detection position. As a result, the X-ray emission axis O automatically coincides with the film center R, and there is no problem.

However, the X-ray tube device X has the center R of the film.
2 is located at a position indicated by a dotted line in FIG. 2, and when performing tilted imaging in which an X-ray is obliquely irradiated to an object (not shown) on the table 23, the table 23 is made of wood. Since it is made of such an opaque material, the bucky device B located on the lower surface of the top plate 23 cannot be seen and it is difficult to align the X-ray emission axis O ′ with the film center R. Therefore, the collimator 32 irradiates a light beam b corresponding to the X-ray emission axis O toward the side of the top plate 23 as shown in FIG. 3, so that the light beam b is directed to the film center R. By rotating the X-ray tube device X about the horizontal axis x, the X-ray emission axis O ′ and the film center R are aligned during tilted imaging.

[0006]

The conventional alignment for irradiating the light beam b to the side of the top plate has the following problems. That is, when the top plate 23 is moved to the right as shown by the dotted line in FIG. 3 for positioning the subject, there is a problem that the bucky device B below it is hidden and invisible and cannot be aligned by the light beam b. In order to solve this point, if the end of the bucking device B is extended to the right as shown by the alternate long and short dash line in FIG. 3, it will not be hidden even if the top plate 23 moves to the position indicated by the dotted line. , Another problem occurs such that the subject gets in and out of the vehicle and hits the operator's foot.

Further, at the time of alignment, the tray 26 is pulled out from the bucking device B, the X-ray tube device X is rotated to adjust the X-ray emission direction to align the light beam with the center of the tray, and then the tray 26 is moved to the bucking device. If it is set in B, it is not necessary to extend the end of the bucking device B to the side, but there is a drawback that the alignment work becomes complicated. In order to solve these problems, there is a top plate made of a transparent acrylic plate so that the center of the film can be seen, but when the subject lies on the top plate, the bucky device disappears. After all, it is not possible to align, and since it is necessary to increase the plate thickness to secure strength,
There is a problem that the X-ray absorption becomes large and the distance between the subject and the film becomes large, so that the image contrast is lowered and a clear image cannot be obtained.

In view of the above, the present invention makes it possible to perform X-ray emission regardless of the X-ray emission direction (X-ray emission angle) at the time of tilt imaging.
An object of the present invention is to provide a Buki photographing apparatus that can perform the alignment for aligning the line irradiation axis with the center of the film easily and accurately, and can perform the alignment while the subject is lying on the top plate.

[0009]

In order to achieve the above-mentioned object, the present invention detects the distance between the X-ray focal point and the film, and the moving distance of the X-ray tube device from the vertical axis passing through the center of the film. A calculating means for calculating the ratio of the detection signals, and X with the horizontal axis passing through the signal and the X-ray focus calculated by the calculating means as the center.
It is characterized in that a determination means for comparing the rotation angle detection signal of the wire tube device and outputting a coincidence signal when the latter signal coincides with the former signal is provided.

[0010]

The calculating means calculates the ratio i / D of the distance D between the X-ray focal point and the film and the moving distance i of the X-ray tube device X from the vertical axis passing through the center of the film. This calculated output signal i /
D is an angle signal tan θ, and tan θ is X in the film center at the position of the X-ray tube device X corresponding to both moving distances D and i.
It is a rotation angle (pivoting angle) with respect to the vertical direction about a horizontal axis passing through the X-ray focal point of the X-ray tube device X with which the ray emission axes coincide. The determination means compares the output signal i / D of the calculation means with the detected rotation angle signal θ of the X-ray tube device X,
When the latter signal coincides with the former signal, a coincidence signal is output, and this coincidence signal drives a lamp or a braking means that blocks rotation of the X-ray tube device X. Therefore, the rotational position of the X-ray tube device in which the lamp is turned on or the rotational position stopped by the braking means is the position where the X-ray emission axis coincides with the center of the film, and the operator should pay attention to the alignment. It can be done easily and surely. Further, since the positioning is not performed by visual observation, the accuracy is high and the object can be laid on the top.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the figure, 1 is an SID detector for detecting the distance between the X-ray focal point and the film 24 in the Buki device B. When the height of the top plate is fixed as in the embodiment shown in FIGS. 2 and 3, Since the distance D ₁ between the floor F and the film 24 is fixed (D ₁ = constant), the distance D ₂ of the X-ray focus f from the floor F is detected, and the former is subtracted from the latter to obtain the X-ray focus-film. The distance SID = D is obtained. In addition, in the case of a tabletop lifting type Bukki photographing table, the distance D ₁ between the floor F and the film 24 changes due to the lifting of the tabletop.
It is necessary to provide a detector for detecting the distance between the floor F-film 24.

2 is the distance between the center of the bucky and the X-ray tube apparatus, that is, the X-ray tube apparatus X from the vertical axis passing through the center of the film.
Distance detector 3 for detecting the movement distance of the SID detector 1
And a distance detector 2 An arithmetic circuit for calculating the ratio of the output signals of both, 4 is a rotation angle detector for detecting the rotation angle of the X-ray tube device X about a horizontal axis x passing through the X-ray focal point, and 5 is a calculation. A comparator that compares the output signals of the circuit 3 and the rotation angle detector 4 and outputs a coincidence signal when the output signal of the rotation angle detector 4 becomes equal to the output of the arithmetic circuit 3, 6 and 7 are comparators, respectively. 5 is a display light driven by the output signal of No. 5 and a brake mechanism that blocks rotation of the X-ray tube device X. Note that SI
The D detector 1, the moving distance detector 2, and the rotation angle detector 4 are
The first detector, the second detector, and the third detector of the present invention, respectively.
And a potentiometer or the like is used as each detector. The arithmetic circuit 3 and the comparison circuit 5 correspond to the arithmetic means and the determination means of the present invention, respectively.

Next, the operation of the apparatus shown in FIG. 1 will be described. When the X-ray tube device X at the position shown by the solid line in FIG. 2 is moved to the position X ′ shown by the dotted line to perform tilt imaging, the carriage 28 is moved to the position shown by the dotted line and the movable mount 30 is fixed to the support column 29. X-ray tube device X by moving up and down along
Adjust the position of. X-ray focus f at adjusted position
The distance D between the films 24 is detected by the SID detector 1, and the moving distance i in the table top longitudinal direction (horizontal direction) from the vertical axis passing through the center R of the film 24 (bucking device B) is the moving distance detector 2. Detected in.

In the case where the Buki device B is a Buki photographing stand that is movable in the horizontal direction like the X-ray tube device X,
A detector for detecting the moving distance from the center position of the bucking device B is provided, and the signal from this detector is used as the moving distance detector 2
The output signal i may be obtained by adding or subtracting to the output signal i. In this case, whether the output signal of the bucking device is added to or subtracted from the output signal of the moving distance detector 2 is determined by the relative moving direction of the bucking device and the X-ray tube device. Add if moving in the opposite direction to the device, subtract if you move in the same direction. The signals D and i of both detectors are subjected to a ratio arithmetic processing in the arithmetic circuit 3, and the output signal i / D thereof is supplied as one input signal of the comparison circuit 5. The angle detection signal θ is supplied to the other side of the comparison circuit 5, and radian comparison is performed.

When the X-ray tube device X is rotated and θ coincides with i / D, that is, tan θ = i / D, the comparison circuit 5 generates a coincidence signal to turn on the indicator lamp 6 or the X-ray tube. The brake mechanism 7 that blocks the rotation of the device X is activated to lock the rotation. The rotating position of the X-ray tube device X in which the indicator lamp 6 is turned on or the locked rotating position is the film 2
The position R is aligned with the center R of the X-ray emission axis O ', and the X-ray tube device X is simply rotated until the indicator lamp 6 or the brake mechanism 7 is operated.
And it can be aligned accurately. In addition, on the front surface of the X-ray tube device X, a brake release button switch for horizontal movement of the carriage 28, vertical movement of the moving base 30, and rotation of the X-ray tube device X, and an operation handle are shown as an integrated body. An operation panel is attached, and positioning and position adjustment of the X-ray tube device X is performed by pressing the brake release button switch corresponding to the moving direction (up and down, left and right) and pressing the operation handle. It is performed by operating in the direction corresponding to.

In the above embodiments, the floor traveling type cage is used as the cage, but it may be an overhead traveling type cage.

Further, in the embodiment, the vertical and horizontal movements of the X-ray tube device and the rotation of the X-ray tube device are manually performed, but they may be performed electrically. Further, in the embodiment, the floating type Bukki photographing base in which the top plate moves horizontally is used, but a fixed type Bukki photographing base in which the top plate does not move may be used. Further, although the cassette type Buki photographing table is used in the embodiment, it may be a cassette type Buki photographing table. Although the indicator lamp is turned on by the output of the comparator, the buzzer may be activated.

[0018]

According to the present invention, it is possible to easily and accurately align the X-ray emission axis with the center (film center) of the bucky device at the time of tilt imaging by the bucky imaging device. In addition, the alignment can be performed without any problem while the subject is placed on the top plate.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a schematic front view showing the configuration of the Buki camera.

FIG. 3 is a side view of FIG. 2;

[Explanation of symbols]

X: X-ray tube device S: Floor-mounted cage BT: Bukki imaging stand B: Bukki device 1: SID detector (first detection means) 2: Moving distance detector (second detection means) 3: Calculation Circuit (arithmetic means) 4: Rotation angle detector (third detection means) 5: Comparison circuit (judgment means) 6: Indicator light 7: Brake mechanism 21: Base 22: Top plate holding frame 23: Top plate 24: Film 25: Cassette 26: Tray 27: Rail 28: Carriage 29: Support 30: Moving stand 31: Telescopic arm 32: Collimator

Claims (1)

[Claims] 1. A Buki photographing apparatus comprising a Buki photographing table and an X-ray tube device which is arranged above it and is rotatably held about a horizontal axis passing through an X-ray focal point as a rotation center. A first detecting means for detecting the X-ray focal length between the X-ray film mounted on the Bukki imaging stand and a horizontal movement distance of the X-ray tube device from a vertical axis passing through the center of the X-ray film. Second detecting means for detecting, third detecting means for detecting a rotation angle of the X-ray tube device, and the first
And calculation means for calculating the ratio of the output signals of the second detection means and the determination means for outputting a match signal when the output signal of the third detection means matches the output signal of the calculation means. Bukki photo-taking device.